package com.nageoffer.shortlink.admin.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.lang.UUID;
import com.alibaba.fastjson2.JSON;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.nageoffer.shortlink.admin.common.biz.user.UserContext;
import com.nageoffer.shortlink.admin.common.convention.exception.ClientException;
import com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum;
import com.nageoffer.shortlink.admin.dao.entity.UserDO;
import com.nageoffer.shortlink.admin.dao.mapper.UserMapper;
import com.nageoffer.shortlink.admin.dto.req.UserLoginReqDTO;
import com.nageoffer.shortlink.admin.dto.req.UserRegisterReqDTO;
import com.nageoffer.shortlink.admin.dto.req.UserUpdateReqDTO;
import com.nageoffer.shortlink.admin.dto.resp.UserLoginRespDTO;
import com.nageoffer.shortlink.admin.dto.resp.UserRespDTO;
import com.nageoffer.shortlink.admin.service.GroupService;
import com.nageoffer.shortlink.admin.service.UserService;
import lombok.RequiredArgsConstructor;
import org.redisson.api.RBloomFilter;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;

import static com.nageoffer.shortlink.admin.common.constant.RedisCacheConstant.LOCK_USER_REGISTER_KEY;
import static com.nageoffer.shortlink.admin.common.constant.RedisCacheConstant.USER_LOGIN_KEY;
import static com.nageoffer.shortlink.admin.common.enums.UserErrorCodeEnum.*;

/**
 * 用户接口实现层
 */
@Service
@RequiredArgsConstructor
public class UserServiceImpl extends ServiceImpl<UserMapper, UserDO> implements UserService
{

    private final RBloomFilter<String> userRegisterCachePenetrationBloomFilter;

    private final RedissonClient redissonClient;

    private final StringRedisTemplate stringRedisTemplate;

    private final GroupService groupService;

    @Override
    public UserRespDTO getUserByUsername(String username) {

        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername, username);

        UserDO userDO = baseMapper.selectOne(queryWrapper);

        if (userDO==null)
        {
            throw new ClientException(UserErrorCodeEnum.USER_NULL);
        }

        UserRespDTO result = new UserRespDTO();

        BeanUtils.copyProperties(userDO, result);
        return result;
    }

    @Override
    public Boolean hasUsername(String username)
    {
        return !userRegisterCachePenetrationBloomFilter.contains(username);
    }

    @Override
    public void register(UserRegisterReqDTO requestParam) {
        if (!hasUsername(requestParam.getUsername())) {
            throw new ClientException(USER_EXIST);
        }

        //使用分布式锁,避免多个请求同时来进行用户注册
        RLock lock = redissonClient.getLock(LOCK_USER_REGISTER_KEY + requestParam.getUsername());

        if(!lock.tryLock()){
            throw new ClientException(USER_NAME_EXIST);
        }

        try {
            UserDO userDO = BeanUtil.toBean(requestParam, UserDO.class);
            int insert = baseMapper.insert(userDO);
            if (insert<1) {
                throw new ClientException(USER_SAVE_ERROR);
            }
            //将用户名添加到布隆过滤器中
            userRegisterCachePenetrationBloomFilter.add(requestParam.getUsername());
            //给刚注册的用户的Group设置为默认分组
            groupService.saveGroup(requestParam.getUsername(),"默认分组");
        }catch (DuplicateKeyException ex) {
            throw new ClientException(USER_EXIST);
        }finally {
            lock.unlock();
        }

    }

    @Override
    public void update(UserUpdateReqDTO requestParam) {
        //判断用户名是否为登录用户
        if (!Objects.equals(requestParam.getUsername(), UserContext.getUsername())) {
            throw new ClientException("当前登录用户修改请求异常");
        }

        LambdaUpdateWrapper<UserDO> updateWrapper = Wrappers.lambdaUpdate(UserDO.class)
                .eq(UserDO::getUsername, requestParam.getUsername());
        baseMapper.update(BeanUtil.toBean(requestParam, UserDO.class), updateWrapper);
    }

    @Override
    public UserLoginRespDTO login(UserLoginReqDTO requestParam) {

        LambdaQueryWrapper<UserDO> queryWrapper = Wrappers.lambdaQuery(UserDO.class)
                .eq(UserDO::getUsername, requestParam.getUsername())
                .eq(UserDO::getPassword, requestParam.getPassword())
                .eq(UserDO::getDelFlag, 0);

        UserDO userDO = baseMapper.selectOne(queryWrapper);

        if (userDO==null)
        {
            throw new ClientException("用户不存在");
        }

        Map<Object, Object> hasLoginMap = stringRedisTemplate.opsForHash().entries(USER_LOGIN_KEY + requestParam.getUsername());

        if (CollUtil.isNotEmpty(hasLoginMap))
        {
            stringRedisTemplate.expire(USER_LOGIN_KEY + requestParam.getUsername(), 30L, TimeUnit.MINUTES);
            String token = hasLoginMap.keySet().stream()
                    .findFirst()
                    .map(Object::toString)
                    .orElseThrow(() -> new ClientException("用户登录错误"));

            return new UserLoginRespDTO(token);
        }

        /**
         * Hash
         * Key：login_用户名
         * Value：
         *  Key：token标识
         *  Val：JSON 字符串（用户信息）
         */
        String uuid = UUID.randomUUID().toString();
        stringRedisTemplate.opsForHash().put(USER_LOGIN_KEY + requestParam.getUsername(), uuid, JSON.toJSONString(userDO));
        stringRedisTemplate.expire(USER_LOGIN_KEY + requestParam.getUsername(), 30L, TimeUnit.MINUTES);

        return new UserLoginRespDTO(uuid);
    }

    @Override
    public Boolean checkLogin(String username, String token) {
        return stringRedisTemplate.opsForHash().get(USER_LOGIN_KEY + username, token) != null;
    }

    @Override
    public void logout(String username, String token) {
        if (checkLogin(username,token))
        {
            stringRedisTemplate.delete(USER_LOGIN_KEY+username);
            return;
        }

        throw new ClientException("用户Token不存在或用户未登录");

    }
}
